About LGS 3D                  About LGS 2D

The LGS 3D geometric constraint solver, developed and supported by LEDAS since 2005, is offered for licensing to all CAD/CAM/CAE software development companies at an affordable price. It is commonly used as parametric engine for history-free 3D geometry editing, assembly design, motion analysis, and other geometric modeling applications. LGS 3D is a cross-platform software packages running on 32- and 64-bit versions of Windows, Linux, Mac OS X, *BSD, AIX, HP-UX, Sun Solaris, and other OSes. Coded in C++, LGS 3D has a C-style API for easy integration into a broad range of software applications using a variety of wrappers, such as .NET, Java, and C++.

LGS 3D supports the creation and modification of geometric models by means of explicit or implicit constraints. (Geometric objects include points, lines, circles, planes, cylinders, spheres, parametric curves, surfaces and swept surfaces.) Objects can be fixed in the absolute coordinate system or relative to each other. Supported geometric constraints include logical constraints between geometric entities (coincidence, parallelism, tangency, and so on), and dimensional constraints that specify the required values for distances, angles, or radiuses. LGS 3D moves and rotates objects to positions that satisfy all constraints, yet minimizes transformations from the initial configuration. Other LGS functions implement advanced features of CAD/CAM/CAE systems, such as diagnostics of over- and under-defined parts of models, engineering variables and equations, help points, and tolerance management.

Sample application named Lege’n’d 3D is available for free download from the LEDAS Web site. It is bundled with a set of representative examples of different kinds of 3D assemblies. The application can be used by anyone to test the functionality, robustness, and performance of LGS 3D. Lege’n’d 3D was created with the Open CASCADE open-source application framework, and its source code is available to all licensees of LGS 3D.

Current version is LGS 3D 2.0 (released in November 2009)

The new LGS 3D version 2.0 contains significant functional enhancements that were suggested by LEDAS customers. It also boosts performance and improves stability. These improvements were obtained after several man-years of testing the components with different applications on thousands of commercial scenarios.

A new API function supports the definition of simultaneous movements by several geometric objects, each with a different rotation and translation. LEDAS customers can now employ more sophisticated scenarios of motion simulation. On the application side, version 2.0 defines optional memory management tools for controlling and optimizing memory use. This new feature is crucial for CAD/CAM/CAE applications that model large assemblies.

The time LGS 3D takes to solve constraints has been significantly reduced, and it is now up to ten times faster than v1.5 for large models. The over-defined constraint diagnostics algorithm has been improved, a function crucial to 3D geometry editing applications that generate many constraints automatically to keep design intent.

Version 2.0 of LGS 3D is already embedded in several commercial applications running on Windows XP/Vista and Mac OS X, including recent versions of the Driving Dimensions plug-in for Google SketchUp and McNeel & Associates’ Rhinoceros. The Driving Dimensions plug-ins aims at making advanced mechanical CAD technology available to all users of popular 3D software at an affordable price. Please visit http://www.DrivingDimensions.com for more information.

For the full list of changes see Release Status page.